Gymnastik- och idrottshögskolan, GIH

Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Validity and Reliability of Two Methods of Calculating Leg Power: Force plate only vs combined force plate and motion analysis
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Aim

The aim of this study was to compare the reliability and describe the concurrent validity of two methods of measuring leg power; the use of a force plate only and the combination of force plate and motion analysis data.

Methods

Eight female second division volleyball players (Mean±SD: Age: 26.5±3.93 years, height: 1.70±0.053m, weight: 65.9±11.1kg) participated in two testing sessions, separated by one to six weeks. In each testing session participants performed three squat jumps (SJ) and three countermovement jumps (CMJ), with leg power for all jumps calculated both from force plate data only, and using force plate data combined with displacement data from motion analysis. Statistics calculated were t-test, intra-class correlation (ICC), and Bland-Atman plots.

Results

While the ICC of the calculated peak power using the two methods was moderate to high (ranging 0.715-0.847) for all jumps, the peak power was always significantly lower using the combined method indicating poor concurrent validity. Leg power decreased from test to retest in both CMJ and SJ, using both methods of calculation, although this decrease was only significant in the SJ using the combined method. The force plate only method showed no significant difference between test and retest, with a small bias (indicating a small systematic error) and a strong test retest correlation in both SJ and CMJ. However, both of these jumps also had quite a large range in the limits of agreements in the Bland-Altman plots. Peak power calculated using the combined method of force plate and motion analysis data showed a greater difference between test and retest values, significant in SJ and tending towards significance in CMJ. This indicates a greater systematic error than in the force plate only method. However, it still had a strong correlation and the range of the limits of agreement was slightly smaller than it was when using the force plate only, indicating a smaller random error.

Conclusions

The systematic differences between test and retest for the two tests indicates that the true peak power achieved by the subjects of the subjects in this study was lower in the retest. The ICC values still indicate results from this study suggest that reliability is acceptable for both methods. Limits of agreement and CI of the mean differences are presented to guide interpretation of individual and group data respectively. Either method could be used to test leg power, but the results from different methods should not be used interchangeably.

Place, publisher, year, edition, pages
2015.
Series
Examensarbete ; 2015:32
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:gih:diva-4173OAI: oai:DiVA.org:gih-4173DiVA, id: diva2:859750
Educational program
Master programme
Supervisors
Examiners
Available from: 2015-10-08 Created: 2015-10-08 Last updated: 2025-02-11Bibliographically approved

Open Access in DiVA

fulltext(521 kB)470 downloads
File information
File name FULLTEXT01.pdfFile size 521 kBChecksum SHA-512
767cb397d4c1f1c5c638f99921240ba62668ad65c526ed2263c1783b3245a4a69c1693cab33629ba9a25eb98398336aa054c7d228afb9dd2a3034d1b880cb4bf
Type fulltextMimetype application/pdf

By organisation
Department of Sport and Health Sciences
Sport and Fitness Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 470 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 468 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf